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Double masking for COVID-19: CDC recommends wearing two masks at the same time



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Two masks are better than one. The new directive to prevent the dissemination of COVID-19 is a double mask. First, Dr. Anthony Fauci endorsed it because “it’s just common sense,” the president’s chief medical adviser told NBC News’ Today. Now the CDC recommends the same.

According to findings from a CDC study, wearing a cloth mask on top of a surgical mask helps improve the fit of the surgical mask. The closer the mask fits to your face, the fewer gaps there are between the mask and your face for coronavirus respiratory droplets to enter. The study found that “the exposure of the recipient was maximally reduced (> 95%) when the source and recipient were equipped with modified masks for medical procedures. These laboratory experiments emphasize the importance of a good fit to optimize mask performance.”

Because layered masks reduce the porosity of your face covering, it’s also more likely to protect you better from those contagious respiratory drops – just like layered coats protect you from the cold and just like an N95 (which is less porous) has a better chance of protecting you from environmental smoke, while a cloth mask (more porous) doesn’t stand a chance.

It’s not all about common sense, though. The concept of double masking is supported by some scientific studies, and no, wearing two masks won’t suffocate you. Here’s what you need to know about wearing two masks to slow the spread of COVID-19.

The science behind double masking

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Layered masks can help reduce the transmission of infectious particles.

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Dr. Fauci’s recommendation comes in the light of new strains of SARS-CoV-2, the coronavirus that causes COVID-19, which are believed to be more transmissible than the primary strain of SARS-CoV-2.

“With a more transmissible virus, this means that any exposure has a greater chance of spreading,” said Andrea Love, an immunologist and microbiologist. “We now need to be stricter with our behavior, including social distancing, minimizing travel to public places, avoiding indoor spaces and always wearing a mask.”

“But not just any mask is enough,” emphasizes Love. “Quality is important.”

Masks work by trapping and blocking respiratory droplets that contain virus particles, Love explains. “The more physical barriers that are implemented, the more of these droplets you can block, reducing the risk to yourself and others around you,” she says. Ideally, the more layers the better, especially if you wear a thin layer fabric face coverEven if you wear surgical masks, which generally already have two thin layers, you can still benefit from doubling, Love says.


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It’s important to understand that cloth masks, such as those routinely worn by most people, were meant to be a stopgap, says Love. Many fabric face covers offer little to no protection, she says, depending on the material, number of layers and fit, which is why health experts recommend layering.

In fact, three layers really are the best: A recent (not yet peer-reviewed) study tested 11 mask materials and found that masks are more protective if they have three layers, two tightly woven fabric layers with a non-woven, highly efficient filter material sandwiched in between . If you don’t already have a three-layer mask, you can mimic this by wearing a cloth mask and a surgical mask – more on that below.

When to wear two masks

If you’re walking outside and aren’t around people outside of your household, a single mask should be enough, Love says. However, if you plan to be close to people who are away from your home, even outdoors, “a simple solution is double masking.”

Will wearing two masks make it difficult to breathe?

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Wearing two masks will not obstruct your oxygen flow.

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Wearing two masks shouldn’t make breathing more difficult, Love says. Several studies have shown that wearing masks does not hinder oxygen consumption (even in adults over 65 years old). “The size of an oxygen molecule is orders of magnitude smaller than the pore size of masks,” says Love, but the problem is “many people don’t realize the difference between discomfort and a true physiological effect.”

Even with two face masks, you can still get the oxygen you need and expel carbon dioxide from your body. Two masks may not feel comfortable at first, but they are still safe to wear.

Of course it can take some getting used to, especially if you wear two masks while exercising. You may get sweeter than usual the warmer the weather. But a little discomfort is much better than catching COVID-19 or being responsible for its spread.

How to properly double mask

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If you have several fabric face covers at home, just wear two.

Chase Evans / CNET

Simply wearing one cloth mask over another can improve the protection of your face covering, but a different combination can help more.

Wearing a cloth mask on top of a surgical mask allows you to mimic the filter cloth combination that studies have shown to be more protective. The surgical mask acts as a filter, and the cloth mask provides an extra layer of protection while improving the fit, says Love. If your two masks fit properly, this combination should “yield an overall efficiency of greater than 90% for particles 1 micron and larger, which is consistent with the average size of respiratory aerosols most important in SARS-CoV transmission. 2. “

As Dr. Fauci told Today, “If you have a physical covering with one layer, you put on another layer, it makes sense that it would probably be more effective.”

The information in this article is for educational and informational purposes only and is not intended to be health or medical advice. Always consult a physician or other qualified health care practitioner if you have any questions about a medical condition or health goals.


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